Feel free to use emojis

Step1: Click Emoji icon right beside the message you want to add a reaction to.

Step2: All emojis will pop out and you can choose the one you want.

Step3: The select emojis will appear below the message.

Step4: You can also use several different emojis, not just one.

Step5: If you want to delete a specific emoji, you can just click on it and it will be deleted.